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annotate mod_http_stats_stream/mod_http_stats_stream.lua @ 2522:72cbec103709

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mod_firewall: Improve HTTP polling logic
author Matthew Wild <mwild1@gmail.com>
date Mon, 20 Feb 2017 09:26:16 +0000
parents 47a6f01231b2
children fd054689a64c
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47a6f01231b2 mod_http_stats_stream: Sends statistics from statsmanager over an HTTP event stream
Kim Alvefur <zash@zash.se>
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1 local statsman = require "core.statsmanager";
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2 local json = require "util.json";
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3
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4 local sessions = {};
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5
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6 local function updates_client_closed(response)
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7 module:log("debug", "Streamstats client closed");
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8 sessions[response] = nil;
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9 end
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10
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11 local function get_updates(event)
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12 local request, response = event.request, event.response;
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13
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14 response.on_destroy = updates_client_closed;
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15
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16 response.conn:write(table.concat({
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17 "HTTP/1.1 200 OK";
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18 "Content-Type: text/event-stream";
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19 "X-Accel-Buffering: no"; -- For nginx maybe?
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20 "";
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21 "event: stats-full";
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22 "data: "..json.encode(statsman.get_stats());
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23 "";
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24 "";
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25 }, "\r\n"));
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26
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27 sessions[response] = request;
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28 return true;
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29 end
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31
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32 module:hook_global("stats-updated", function (event)
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33 local data = table.concat({
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34 "event: stats-updated";
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35 "data: "..json.encode(event.changed_stats);
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36 "";
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37 "";
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38 }, "\r\n")
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39 for response in pairs(sessions) do
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40 response.conn:write(data);
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41 end
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42 end);
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43
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44
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45 module:depends("http");
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46 module:provides("http", {
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47 route = {
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48 GET = get_updates;
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49 }
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50 });